On the right-hand sidebar I posted a survey --- "Who Is Most Responsible For Online Sales?" Please take a second to take the poll.
For example, if you receive a Coldwater Creek catalog, then visit the Coldwater Creek website to buy merchandise, then "offline methods" are responsible --- they created interest that caused the customer to visit the website and buy something.
If you answered "Online Marketing", please use the comments section to describe the online methods you believe create online sales. In other words, what are the online marketing strategies that cause a customer to "want" something they previously didn't want --- methods that don't simply intercept a customer on a mission stimulated by an offline campaign? We might think about e-mail marketing (which is really direct marketing, not online marketing) and portal advertising as two options. What else?